fix: 修复客服权限与收件箱配置问题

frontend/app/javascript/shared/helpers/clipboard.js

@@ -33,6 +33,7 @@ export const copyTextToClipboard = async data => {
   document.body.appendChild(textarea);
 
   try {
+    textarea.focus({ preventScroll: true });
     textarea.select();
     textarea.setSelectionRange(0, textarea.value.length);
 

frontend/app/javascript/shared/helpers/specs/clipboard.spec.js

@@ -2,6 +2,7 @@ import { copyTextToClipboard, handleOtpPaste } from '../clipboard';
 
 const mockWriteText = vi.fn();
 const mockExecCommand = vi.fn();
+const originalCreateElement = document.createElement.bind(document);
 
 const setClipboard = clipboard => {
   Object.defineProperty(navigator, 'clipboard', {
@@ -148,9 +149,16 @@ describe('copyTextToClipboard', () => {
 
     it('falls back when clipboard API is not available', async () => {
       setClipboard(undefined);
+      const focus = vi.fn();
+      vi.spyOn(document, 'createElement').mockImplementation(tagName => {
+        const element = originalCreateElement(tagName);
+        if (tagName === 'textarea') element.focus = focus;
+        return element;
+      });
 
       await copyTextToClipboard('test');
 
+      expect(focus).toHaveBeenCalledWith({ preventScroll: true });
       expect(mockExecCommand).toHaveBeenCalledWith('copy');
       expect(document.querySelector('textarea')).toBeNull();
     });